Why is lateral root growth so variable? A framework to analyze growth variability among lateral roots and the possible roles of auxin and carbon

Beatriz Moreno-Ortega 1, 2 Emilie Chandezon 2 Guillaume Fort 2 Yann Guédon 1, 3 Bertrand Muller 2
1 VIRTUAL PLANTS - Modeling plant morphogenesis at different scales, from genes to phenotype
CRISAM - Inria Sophia Antipolis - Méditerranée , INRA - Institut National de la Recherche Agronomique, Centre de coopération internationale en recherche agronomique pour le développement [CIRAD] : UMR51
Abstract : Lateral root (LR) development is a major component of the efficiency of a plant to capture soil resources. A remarkable facet of lateral root behavior is stochasticity affecting the different stages of LR growth, leading to a large range of lateral root lengths along the primary root. It has been argued that such variability among LR could be an adaptive trait enabling a greater plasticity and efficiency of the root system in front of the spatial and temporal heterogeneity of soil resources (Forde, 2009). In order to characterize variability in LR growth and evaluate the role of hormonal and biochemical signals that might influence it, we analyzed the patterns of development of hundreds of lateral roots in a set of maize seedlings grown in rhizotrons. The SmartRoot toolbox was used to provide a comprehensive recording of individual root growth dynamics. Using a clustering method based on growth variables such as elongation rate and growth duration, we could identify 3 main different elongation patterns in maize LRs composed of accelerating, slowly decelerating and rapidly arrested LRs, as found in other species (Pagès, 1995). The molecular and cellular characterization of these root types revealed differences in meristem size, apical diameters as well as apical diameter variation. Moreover, fast growing roots showed increased sugar content along their tips. Finally, by affecting either the sugar or the auxin status (by pruning seminal roots or using auxin transport mutants) we differentially altered the proportion of the different root types, suggesting that both signals contribute to shape the root system in response to variations of environmental conditions.FORDE, B. (2009), J. Exp. Bot. 60 (14): 3989-4002PAGES, L. (1995), New Phytologist, 130: 503–509
Type de document :
Poster
7th International Symposium on Root Development, Sep 2014, Weimar, Germany
Liste complète des métadonnées

https://hal.inria.fr/hal-01090030
Contributeur : Christophe Godin <>
Soumis le : mardi 2 décembre 2014 - 17:29:35
Dernière modification le : vendredi 19 octobre 2018 - 15:22:02

Identifiants

  • HAL Id : hal-01090030, version 1

Collections

Citation

Beatriz Moreno-Ortega, Emilie Chandezon, Guillaume Fort, Yann Guédon, Bertrand Muller. Why is lateral root growth so variable? A framework to analyze growth variability among lateral roots and the possible roles of auxin and carbon. 7th International Symposium on Root Development, Sep 2014, Weimar, Germany. 〈hal-01090030〉

Partager

Métriques

Consultations de la notice

329

Téléchargements de fichiers

50